Thanks to all who have responded to the Fluorometer/Fluorimeter post:
Here are excerpts (parts edited) of some responses.
From: rms at acsu.buffalo.edu (Robert M. Straubinger)
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There are 3 major US manufacturers
with which I am acquainted: Photon Technologies Inc (PTI), SLM/Aminco,
and SPEX. I am unfamiliar with ISS, but from their address,
I have the faint suspiscion that the people involved may be formerly
involved with SLM, or at least may have come out of the lab of the
legendary Gregorio Weber.